Why I'm Running: Kristen Wiley

JACKSONVILLE, Fla. -- What a difference a year makes for Kristen Wiley.

Last year while thousands of runners were competing in the 26.2 With Donna, Kristen was just beginning her treatment for breast cancer. Now, one year later, she is nearing the end of her treatment.

When Kristen returned to work in March of 2012, one of her co-workers had left his medal from the 26.2 With Donna on her desk. While Kristen was touched by the gesture, she told the co-worker that she couldn't keep his medal. He then said that he'll take it back when she completes the marathon herself. That's exactly what she plans to do this Sunday.